Marantz 4230 Humming?

[SYK3S]

Hi Guys Got A Marantz 4230 i have a hum comming from the rear channels only and also from the rear headphone socket and also when i am on FM and when the FM Stereo Light illuminates i get a hum when on stereo mode no hum on mono can anybody help me with this niggle please
thanks

 

[theophile]

Can you identify the tune that it is humming? :scratch2:

 

[SYK3S]

serious replys only please

 

[ChrisMarantz]

You might try posting the question in the Marantz forum, there's more 4230 experience there